Superconducting microwave filter systems for cellular telephone base stations

Rommel, Simon; Hammond, R. B.; Berkowitz, S. J.; Willemsen, Balam A.

doi:10.1109/jproc.2004.833661

Cited by 77 publications

(39 citation statements)

References 20 publications

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“…These nonlinearities cause mixing of signals and generation of new tones, which give an undesired intermodulation distortion in the context of microwave filter design [6]. However these same nonlinearities can also be used to realize a desirable effect known as parametric amplification.…”

mentioning

confidence: 99%

Nonlinearities and parametric amplification in superconducting coplanar waveguide resonators

Tholén

Ergül

Doherty

et al. 2007

Applied Physics Letters

109

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Experimental investigations of the nonlinear properties of superconducting niobium coplanar waveguide resonators are reported. The nonlinearity due to a current dependent kinetic inductance of the center conductor is strong enough to realize bifurcation of the nonlinear oscillator. When driven with two frequencies near the threshold for bifurcation, parametric amplification with a gain of +22.4 dB is observed.

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confidence: 99%

Nonlinearities and parametric amplification in superconducting coplanar waveguide resonators

Tholén

Ergül

Doherty

et al. 2007

Applied Physics Letters

109

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“…Compared to their normal-metal counterparts the important advantage of superconducting (SC) devices is their small HF absorption, providing ultrahigh (>10 6 ) quality factor, Q [1]. The power handling capability of HTS systems is limited by strong nonlinearity (NL) of the surface impedance in d-wave cuprates at high exciting HF field.…”

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confidence: 99%

Measurement of local reactive and resistive photoresponse of a superconducting microwave device

Zhuravel

Anlage

Ustinov

2006

Applied Physics Letters

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We propose and demonstrate a spatial partition method for the high-frequency photo-response of superconducting devices correlated with inductive and resistive changes in microwave impedance. Using a laser scanning microscope, we show that resistive losses are mainly produced by local defects at microstrip edges and by intergrain weak links in the hightemperature superconducting material. These defects initiate nonlinear high-frequency response due to overcritical current densities and entry of vortices.

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“…This is because the usual band pass filter failed to distinguish the frequency bands of the companies. It was found that the quality of speech in mobile-phones was improved significantly by using an HTS filter and superconducting base stations have spread rapidly in the United States [11][12]. Although the use of a superconducting bandpass filters was also studied in the third generation wireless communication system IMT-2000 [13][14][15][16], unfortunately, the superconducting bandpass filter system was not adopted because of its high price…”

Section: Superconducting Bandpass Filters For Wireless Communicationmentioning

confidence: 99%

A Thirty-year History of Superconducting Microwave Devices and Fundamental Studies Thereof

Ohshima

2018

J. Phys.: Conf. Ser.

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Abstract. Thirty years have passed since the discovery of high-temperature superconductors (HTS), and practical applications of HTS equipment and devices are moving into full-swing. From the beginning of their discovery, the use of HTS in microwave devices has been recognized as one of their most practical applications. This is because the surface resistance of HTS is about 1/1000 of that of pure copper at 1 GHz and 77 K. From early on, researchers have recognized that high performance of microwave passive devices could be realized by utilizing the characteristics of HTS. In addition, the size of HTS microwave devices is relatively small, and they can be cooled by a small cryocooler. Furthermore, we were able to establish high-quality HTS thin-film fabrication technology essential for producing high performance microwave devices in a short period of time. In view of the above, I would like to present an overview of the past thirty years of superconducting microwave devices and fundamental studies thereof.

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Superconducting microwave filter systems for cellular telephone base stations

Cited by 77 publications

References 20 publications

Nonlinearities and parametric amplification in superconducting coplanar waveguide resonators

Nonlinearities and parametric amplification in superconducting coplanar waveguide resonators

Measurement of local reactive and resistive photoresponse of a superconducting microwave device

A Thirty-year History of Superconducting Microwave Devices and Fundamental Studies Thereof

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